BoilerFaultCodesThe 6 most common faults
Your boiler has shut down because the water inside the unit has become too hot, likely due to a circulation problem or a blockage.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barSwitch the boiler off and back on to attempt a reset once the system has cooled down
Your boiler is failing to light the gas, meaning it cannot create the heat needed for your heating or hot water.
Check that your gas emergency control valve is in the open positionIf you have a prepay meter, check that you have credit availablePress the reset button to see if the system restarts normally
Your boiler started to heat up but the flame went out unexpectedly, causing the system to shut down for safety.
Check that your gas emergency control valve is open and you have credit on your gas meterCheck if other gas appliances, like a hob, are working correctlyPress the reset button to see if the boiler restarts
Your boiler has shut down because the internal water temperature has become too hot.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1 and 1.5 barPress the reset button and wait for the boiler to restart
Your boiler has failed to ignite, which is likely due to an electrical supply issue or a problem with the gas delivery.
Check that your gas meter has credit and the isolation valve is openEnsure other gas appliances in your home are workingTry resetting the boiler using the control panelCheck your home's fuse box/consumer unit to ensure the boiler circuit hasn't tripped
Your boiler is struggling to circulate water properly, causing the flame to cut out shortly after it starts to prevent overheating.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is low, use the external filling loop to top it up to the correct level.Ensure all radiator valves and isolation valves under the boiler are fully open.
on the Dimplex System 30
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Dimplex shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue